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PDF BA7184 Data sheet ( Hoja de datos )
| Número de pieza | BA7184 | |
| Descripción | 4-channel PRE / REC amplifier with auto-tracking interface | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Video ICs
4-channel PRE / REC amplifier with
auto-tracking interface
BA7184S
The BA7184S is a PRE / REC amplifier developed for use in video cassette recorders. It is compatible with four-head
decks and features built-in FB damping, four preamplifiers, a chroma output amplifier, an FM output amplifier (with
AGC), an envelope detector and envelope comparator, a constant-current BTL-drive REC amplifier (with AGC) and
channel switching, EP / SP switching, and mode switching integrated onto a single monolithic IC.
•Applications
VCRs
•Features
1) The playback amplifier has a total gain of 56dB
(Typ.), and has a low-noise preamplifier. Designed
for VHS band operation with low external parts
count. The IC has 4 circuits for 4-head VCR applica-
tions.
2) Two playback output systems (through output and
AGC output). The AGC output level is 315mVP-P
(Typ.); suitable for FM brightness signal output.
3) Auto-tracking interface for automated tracking
adjustment. Linear detector characteristic with sen-
sitivity that can be set using external components.
4) The recording amplifier uses constant-current BLT
drive that handles load variations (i.e. headimped-
ance) well, and gives stable recording characteris-
tics. 2 circuits are provided for 4-head VCR use.
5) Built-in recording level AGC means adjustment of
FM recording current is not necessary.
6) Head switches for 4-channel PRE / REC system
provided.
7) Operates off a single 5V power supply, with low
power dissipation.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Applied voltage
Power dissipation
VCC 7.0
Pd 1050∗1
Operating temperature
Topr
– 20 ~ + 65
Storage temperature
Tstg – 55 ~ + 125
∗1 Reduced by 10.5mW for each increase in Ta of 1°C over 25°C (free air).
Unit
V
mW
°C
°C
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ. Max.
Playback / recording VCC
4.5 5.0 5.5
᭺ Not designed for radiation resistance.
Unit Conditions
V 13pin
1
1 page  
Video ICs
•Measurement circuits
(Playback system)
BA7184S
VCC 5V
+
24 23 22 21 20 19 18 17 16 15 14 13
DET
AGC
PEAK ENVE
RF
LOGIC
COMP MUTE VCC
REC
ENVE
ENVE
AGC
SP EP
DET
PRE PRE
PRE PRE
1 2 3 4 5 6 7 8 9 10 11 12
Fig. 1
Units: R [Ω]
C [F]
L [H]
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA7184.PDF ] | |
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